Adjust the axial clearance of the camshaft of the biogas generator set. Due to the thermal expansion of camshaft during operation, a certain axial clearance is required. However, if the clearance is too large, more than 2.5mm, it will lead to the axial movement of the camshaft and increase the wear of the parts. In addition, the change of camshaft position will cause the change of gas distribution phase, which will affect the normal operation of Shandong biogas generator. Therefore, the camshaft should be positioned axially. When the generator is working, it is necessary to adjust the clearance of the camshaft due to the wear and looseness of the parts, or after the removal of the timing gearbox cover, so as to ensure the normal operation of the camshaft. The axial positioning of the generator camshaft is realized by the thrust screw on the gearbox cover. When adjusting, tighten the thrust pin to the end, eliminate the axial clearance, and then return about 1 / 4 turn.

　　不要堵塞發(fā)電機(jī)曲軸箱的排氣口。在發(fā)電機(jī)的工作過(guò)程中，每當(dāng)活塞下降時(shí)，曲軸箱內(nèi)的氣體(包括泄漏出來(lái)的氣體)受到壓縮，曲軸箱內(nèi)的氣體壓力增大，引起油底殼接頭表面的漏油，對(duì)活塞的運(yùn)動(dòng)產(chǎn)生阻力。因此，發(fā)電機(jī)曲軸箱應(yīng)該有排氣口。

　　Do not block the exhaust port of the generator crankcase. In the working process of the generator, whenever the piston drops, the gas in the crankcase (including the leaked gas) is compressed, and the gas pressure in the crankcase increases, which causes the oil leakage on the joint surface of the oil pan and produces resistance to the movement of the piston. Therefore, the generator crankcase should have an exhaust port.

　　不同類型的發(fā)電機(jī)，曲軸箱的排氣位置是不一樣的，但其工作原理是一樣的，即單向閥的作用原理。當(dāng)活塞從死點(diǎn)移動(dòng)到死點(diǎn)時(shí)，曲軸箱壓力增大，打開閥門，使氣體排出;當(dāng)活塞從底部移動(dòng)到頂部時(shí)，曲軸箱壓力隨著空間的增大而下降到負(fù)壓。負(fù)壓使氣門堵塞曲軸箱和外界的通道，防止外界灰塵進(jìn)入曲軸箱，保持潤(rùn)滑油清潔，并使發(fā)電機(jī)工作時(shí)的潤(rùn)滑油泄漏機(jī)會(huì)減少。因此，發(fā)電機(jī)曲軸箱的通風(fēng)機(jī)應(yīng)保持暢通，以保證曲軸箱的排氣。

　　The exhaust position of crankcase is different for different types of generator, but its working principle is the same, that is, the working principle of one-way valve. When the piston moves from the dead point to the dead point, the crankcase pressure increases, and the valve is opened to discharge the gas; when the piston moves from the bottom to the top, the crankcase pressure decreases to the negative pressure with the increase of space. The negative pressure makes the valve block the passage between the crankcase and the outside, prevents the outside dust from entering the crankcase, keeps the lubricating oil clean, and reduces the chance of lubricating oil leakage when the generator is working. Therefore, the fan of generator crankcase shall be kept unblocked to ensure the exhaust of crankcase.

　　沼氣發(fā)電機(jī)組曲軸失效原因的正確分析

　　The correct analysis of the crankshaft failure of biogas generator set曲軸燒蝕主要是由于曲軸軸頸與軸瓦之間沒有形成有效的潤(rùn)滑膜，導(dǎo)致曲軸軸頸與軸瓦之間產(chǎn)生直接的摩擦。當(dāng)發(fā)電機(jī)發(fā)生曲軸燒蝕時(shí)，會(huì)發(fā)出白煙、金屬撞擊的奇怪聲音，甚至?xí)?dǎo)致曲軸與軸瓦鎖在一起而無(wú)法轉(zhuǎn)動(dòng)。因此，必須正確分析和判斷其失效的原因。

　　The main reason of crankshaft ablation is that there is no effective lubricating film between crankshaft journal and bearing bush, which leads to direct friction between crankshaft journal and bearing bush. When the crankshaft of the generator is ablated, it will make a strange sound of white smoke and metal impact, and even lead to the crankshaft and bearing shell locked together and unable to rotate. Therefore, it is necessary to correctly analyze and judge the cause of its failure.

　　一是油品質(zhì)量差

　　First, the quality of oil products is poor低質(zhì)量的石油。所選用的油品質(zhì)量等級(jí)和粘度等級(jí)較低，或不同品牌的油混合使用，導(dǎo)致油品性能不能滿足要求;機(jī)油在使用過(guò)程中混入大量的粉塵，由于發(fā)電機(jī)工作溫度高，導(dǎo)致機(jī)油氧化變質(zhì)。氧化變質(zhì)的油呈黑色，變鈍，濃度增加，用兩指擰油，感覺油變稀。一旦注油泵和潤(rùn)滑油通道可以檢查發(fā)電機(jī)上部是否有水氣或水珠。如果石油股票是不夠的,將導(dǎo)致發(fā)電機(jī)潤(rùn)滑油流量不足,然后不能確保發(fā)電機(jī)可以檢查油底殼的油量,油壓力表閱讀,進(jìn)一步檢查石油管道是否堵塞、泄漏和其他異?，F(xiàn)象。

　　Low quality oil. The quality grade and viscosity grade of the selected oil are low, or different brands of oil are mixed, resulting in the performance of the oil can not meet the requirements; a large amount of dust is mixed into the oil during the use process, resulting in the oxidation and deterioration of the oil due to the high working temperature of the generator. The oxidized oil is black, blunt, and the concentration is increased. Screw the oil with two fingers, and the oil becomes thinner. Once the oil pump and lubricating oil channel are filled, check whether there is water vapor or water drop on the upper part of the generator. If the oil stock is not enough, it will lead to insufficient lubricating oil flow of the generator, and then it cannot be ensured that the generator can check the oil volume of the oil pan, read the oil pressure gauge, and further check whether the oil pipeline is blocked, leaked and other abnormal phenomena.

　　曲軸、飛輪、離合器動(dòng)平衡超差

　　The dynamic balance of crankshaft, flywheel and clutch is out of tolerance當(dāng)動(dòng)平衡超差時(shí)，曲軸的高速轉(zhuǎn)動(dòng)產(chǎn)生慣性力，慣性力會(huì)破壞曲軸軸頸與軸瓦之間的配合間隙。

　　When the dynamic balance is out of tolerance, the high-speed rotation of crankshaft will produce inertia force, which will destroy the fit clearance between crankshaft journal and bearing bush.

　　故障一般發(fā)生在機(jī)器運(yùn)行1萬(wàn)公里后。曲軸燒蝕后，軸頸上殘留的碎屑可以清除，動(dòng)平衡可以再次檢查。其不平衡基本上可以代表燒蝕期刊動(dòng)平衡的超差。

　　The fault usually occurs after the machine runs 10000 km. After the crankshaft is ablated, the residual debris on the journal can be removed and the dynamic balance can be checked again. The unbalance can basically represent the out of tolerance of dynamic balance of ablation journals.

　　維護(hù)不當(dāng)

　　Improper maintenance

　　沼氣發(fā)電機(jī)組運(yùn)行一段時(shí)間后，如不及時(shí)、合理地進(jìn)行維護(hù)，將導(dǎo)致油泵限壓閥等部件磨損、失效、變形。機(jī)油濾芯將機(jī)油、泥漿堵塞，使機(jī)油壓力降低，造成曲軸燒蝕。

　　If the biogas generator unit is not maintained timely and reasonably after a period of operation, it will lead to the wear, failure and deformation of oil pump pressure limiting valve and other components. The engine oil filter element blocks the engine oil and mud, reduces the engine oil pressure and causes the crankshaft to be ablated.